I've been having problems with MythTV crashing often but not every time (feels like a race condition) on Fedora 16 with 290.10 using a NVIDIA ION (GT218). Managed to get it to occur in two places just by opening the main menu (not even playing video). However if I can get past this and start some video it all seems to go fine after that (however sometimes I'll also get into the menu but crash just before the video should start).